US4748705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame resistant polyester/cotton fabric and process for its production
Assignee: Burlington Industries LLC
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Filing: 1987-03-09
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Granted: 1988-06-07
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Expires: 2007-03-09
Abstract
Abstract Flame resistance is imparted to high polyester content (50%) polyester/cotton blend fabrics by the successive application of a cyclic phosphonate ester flame retardant followed by THP/urea precondensate/NH3 and then by THPS. Commercially acceptable, flame retarded polyester/cotton products with improved hand result.
Inventors
- 👤 James R. Johnson
- 👤 Chumpon Sujarit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:08
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/288; D06M2200/00; D06M2200/30; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2672
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
A process for imparting flame resistance to a polyester/cotton blend fabric containing at least about 40% by weight polyester, comprising the successive steps of: (1) applying to a polyester/cotton blend fabric a flame-retarding amount of a cyclic phosphonate ester represented by the formula: ##STR4## in which x is 0 or 1, that fixes onto the polyester fibers; (2) applying to the fabric a flame-retarding amount of a prepolymer condensate of urea and a tetrakis(hydroxymethyl)phosphonium salt flame retardant that fixes to the cotton fibers, exposing the prepolymer condensate-containing fabric to a source of ammonia to form an ammoniated prepolymer of tetrakis(hydroxymethyl)phosphonium salt/urea to form a flame-retardant polymer network within the cotton fiber structure; and (3) applying an additional flame-retarding amount of a tetrakis(hydroxymethyl)phosphonium sulfate and urea to the fabric, heating the fabric to form an insoluble phosphorus-containing polymer in and on the cotton fibers and oxidizing the fabric with hydrogen peroxide to further improve the flame resistance imparted by the phosphorus, steps (1), (2), and (3) conducted in the order stated.
Claim 2
Dependent Claim
170 words
A process for imparting flame resistance to a polyester/cotton blend fabric containing at least about 40% by weight polyester, comprising the successive steps of: (1) applying to a polyester/cotton blend fabric a flame-retarding amount of a cyclic phosphonate ester represented by the formula: ##STR4## in which x is 0 or 1, that fixes onto the polyester fibers; (2) applying to the fabric a flame-retarding amount of a prepolymer condensate of urea and a tetrakis(hydroxymethyl)phosphonium salt flame retardant that fixes to the cotton fibers, exposing the prepolymer condensate-containing fabric to a source of ammonia to form an ammoniated prepolymer of tetrakis(hydroxymethyl)phosphonium salt/urea to form a flame-retardant polymer network within the cotton fiber structure; and (3) applying an additional flame-retarding amount of a tetrakis(hydroxymethyl)phosphonium sulfate and urea to the fabric, heating the fabric to form an insoluble phosphorus-containing polymer in and on the cotton fibers and oxidizing the fabric with hydrogen peroxide to further improve the flame resistance imparted by the phosphorus, steps (1), (2), and (3) conducted in the order stated.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which the fabric contains 40% to 85% by weight polyester, balance substantially entirely cotton.
Claim 4
Dependent Claim
14 words
The process of claim 2 in which the fabric is a 40/60 polyester/cotton blend.
Claim 5
Dependent Claim
14 words
The process of claim 2 in which the fabric is a 65/35 polyester/cotton blend.
Claim 6
Dependent Claim
14 words
The process of claim 2 in which the fabric is a 50/50 polyester/cotton blend.
Claim 7
Dependent Claim
14 words
The process of claim 1 in which the tetrakis(hydroxymethyl)phosphonium salt is the chloride salt.
Claim 8
Dependent Claim
14 words
The process of claim 1 in which the tetrakis(hydroxymethyl)phosphonium salt is the sulfate salt.
Claim 9
Dependent Claim
14 words
The process of claim 1 in which the tetrakis(hydroxymethyl)phosphonium salt is the oxalate salt.
Claim 10
Dependent Claim
14 words
The process of claim 1 in which the tetrakis(hydroxymethyl)phosphonium salt is the phosphate salt.
References Cited (Backward Citations)
US4066812A
Cited
US4494951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |